Lou is right. On your actual table with the grid, the line through centers of the CB and 13 ends about three inches to the left of the pocket as the shooter stands, on the footrail. On your Wei table sketch, the line through the centers is pointing about 3/4 of a diamond to the right of the pocket, on the long rail. You can also see that in your Wei sketch the 13 ball is at the midpoint of two of the cross-lines (that go from long rail to long rail). In the actual photo, it's not in the midpoint but rather much closer to one of the cross-lines. (This could be partly due to the difference between an aerial view and an angled view.)
That aside, in your Wei table sketch, it's fairly natural to get on the 6 and then come over for the 7/10/3/5. In the actual shot, if you use Lou's paper method, it looks feasible to hit the 13 about 15 mph and stun over for the 7.
I suspect the logic was "I lose even if I rattle this ball and leave it in the hole, but if I make it, then I still have to play safe." For me, I'd still shoot the 13, but to get a better line on the safety where I don't have to shoot over the 12 ball.
Cory